Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 39648-67-4, C20H13O4P. A document type is Article, introducing its new discovery., category: chiral-catalyst
We report that R and S quenchers <(R)-(+)- and (S)-(-)-N,N-dimethyl-1-phenethylamine,RQ and SQ> recognize differently an R exciced-state chiral surface (silica derivatized with (R)-(-)-1,1-binaphthyl-2,2′-dihydrogen phosphate, RS).This is revealed by a ca. 30percent difference in Stern-Volmer constans between RQ/RS and SQ/RS.A similar recognition difference was obtained between these quenchers and the corresponding S-(+) surface.The surface derivatization enhances the chiral recognition; in solution, no difference between the constans was observed.It is suggested that what we believe to be the first observation of a photophysical recognition of a chiral surface can be explained in terms of an increase in the relative weight of an exciplex formation (over ion-pair formation) quenching route and and in terms of the decrease in the dimensionality of the quenching process.
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